Messages in this thread | | | From | "Rafael J. Wysocki" <> | Subject | Re: Hibernation Redesign | Date | Thu, 12 Jul 2007 00:34:12 +0200 |
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On Thursday, 12 July 2007 00:17, Al Boldi wrote: > Mark Lord wrote: > > Jeremy Maitin-Shepard wrote: > > > I'll certainly admit the kexec idea is vaporware currently, > > Your idea is starting to become a reality with this thread: > "[PATCH 0/2] Kexec jump: The first step to kexec base hibernation" > > > > but it does > > > differ in a significant way from freezer-based approaches, such that I > > > don't think it should be referred to as just another implementation of a > > > freezer. Specifically, it doesn't require that the "old kernel" be in a > > > "consistent" state to a greater extent than suspend to ram; it is the > > > case that all of the devices must be quiesced or shut down to some > > > extent, but doing this without races and deadlocks (and without the > > > freezer) is certainly very, very similar to what needs to be done for > > > suspend to ram, which will need to be solved anyway. Unlike the > > > existing hibernate approaches, however, it will not be necessary to use > > > any of the driver infrastructure once switched to the "save image" > > > kernel, and thus it will not matter what locks are held, for instance. > > > > I really doubt that kexec(a special kernel) is going to solve anything > > here. The new kernel will have to initialize, probe for devices, etc. > > Which will take time. > > Which will slow down hibernate to an unacceptable degree. > > Right now, it (TuxOnIce) is *very* fast. > > Adding 10 seconds or so for reprobing/resetting/reiniting devices > > is not going to be useful. > > And modifying all of the drivers to *not* do their usual probe sequence > > sounds rather intrusive and is likely also a non-starter here. > > > > Or is it? > > Well, it's definitely less intrusive than readying drivers for the freezer.
There's nothing like this!
Greetings, Rafael
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